Question

我可以ATTACH数据库并将所有数据从一个数据库复制到另一个数据库。但最后我无法使用相同的代码将其分离。

     var connection = new SQLiteConnection(connection)
     connection.Open();
     sqlAttachCommand = "ATTACH database '" + fileLoc + "' AS toMerge";
     var cmd= new SQLiteCommand(sqlAttachCommand);
     cmd.Connection = connection;
     cmd.ExecuteNonQuery();
     ...
     sqlAttachCommand = "DETACH database '" + fileLoc + "'";

例外是：

SQL逻辑错误或缺少数据库没有这样的数据库：C：\ temp \ database.db＆＃34;。

这很奇怪，因为我确实附上了它，我从这个数据库中复制了所有数据。

Answer 1

The DETACH DATABASE command takes a schema-name as parameter, not a database file.

So your detach command should be like this:

sqlAttachCommand = "DETACH database toMerge";

as in your ATTACH command you named the thing toMerge.

In the SQL Exception the missing database isn't referring to the fact that SQLite lost that file, it is mere trying to tell that you're using a schema-name that doesn't exist.

无法DETACH数据库（来自c＃）

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